Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 894 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 45 × 33 = 1487. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 50 × 62 = 3100. Correct or wrong? (a) wrong (b) correct
3. 3.Check with nines: 25 × 14 = 345. Correct or wrong? (a) wrong (b) correct
4. 4.Check with nines: 789 + 954 = 1745. Correct or wrong? (a) correct (b) wrong
5. 5.Check with nines: 871 + 434 = 1305. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 745 + 803 = 1548. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 763 + 233 = 989. Correct or wrong? (a) wrong (b) correct
8. 8.Check with nines: 561 + 413 = 968. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 71 × 74 = 5253. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 73 × 32 = 2336. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 521 + 700 = 1221. Correct or wrong? (a) correct (b) wrong
12. 12.Check with nines: 24 × 33 = 793. Correct or wrong? (a) wrong (b) correct
13. 13.Check with nines: 848 + 373 = 1221. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 19 × 58 = 1102. Correct or wrong? (a) correct (b) wrong
15. 15.Check with nines: 70 × 13 = 910. Correct or wrong? (a) correct (b) wrong
16. 16.Check with nines: 29 × 32 = 928. Correct or wrong? (a) wrong (b) correct
17. 17.Check with nines: 528 + 592 = 1120. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 704 + 569 = 1278. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 451 + 300 = 745. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 59 × 36 = 2124. Correct or wrong? (a) wrong (b) correct
21. 21.Check with nines: 59 × 97 = 5731. Correct or wrong? (a) correct (b) wrong
22. 22.Check with nines: 26 × 72 = 1868. Correct or wrong? (a) wrong (b) correct
23. 23.Check with nines: 330 + 984 = 1317. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 50 × 75 = 3750. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 868 + 594 = 1461. Correct or wrong? (a) wrong (b) correct
26. 26.Check with nines: 198 + 142 = 337. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 45 × 34 = 1532. Correct or wrong? (a) correct (b) wrong
28. 28.Check with nines: 16 × 23 = 368. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 36 × 79 = 2837. Correct or wrong? (a) correct (b) wrong
30. 30.Check with nines: 21 × 56 = 1176. Correct or wrong? (a) correct (b) wrong
31. 31.Check with nines: 45 × 89 = 4005. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 93 × 21 = 1953. Correct or wrong? (a) correct (b) wrong
33. 33.Check with nines: 938 + 724 = 1667. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 87 × 85 = 7399. Correct or wrong? (a) correct (b) wrong
35. 35.Check with nines: 53 × 82 = 4346. Correct or wrong? (a) correct (b) wrong
36. 36.Check with nines: 44 × 76 = 3346. Correct or wrong? (a) correct (b) wrong
37. 37.Check with nines: 266 + 156 = 421. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 77 × 54 = 4158. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 553 + 871 = 1424. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 52 × 87 = 4524. Correct or wrong? (a) wrong (b) correct

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